- update python-gdb.py from v3 to v4 (fixing infinite recursion on
reference cycles and tracebacks on bytes 0x80-0xff in strings, adding
handlers for sets and exceptions)
This commit is contained in:
dmalcolm
parent
485fd76f7f
commit
da0826ad3b
151
python-gdb.py
151
python-gdb.py
@ -35,6 +35,7 @@ import gdb
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# Look up the gdb.Type for some standard types:
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_type_char_ptr = gdb.lookup_type('char').pointer() # char*
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_type_unsigned_char_ptr = gdb.lookup_type('unsigned char').pointer() # unsigned char*
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_type_void_ptr = gdb.lookup_type('void').pointer() # void*
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_type_size_t = gdb.lookup_type('size_t')
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@ -140,7 +141,7 @@ class PyObjectPtr(object):
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# Can't even read the object at all?
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return 'unknown'
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def proxyval(self):
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def proxyval(self, visited):
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'''
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Scrape a value from the inferior process, and try to represent it
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within the gdb process, whilst (hopefully) avoiding crashes when
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@ -150,6 +151,11 @@ class PyObjectPtr(object):
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For example, a PyIntObject* with ob_ival 42 in the inferior process
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should result in an int(42) in this process.
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visited: a set of all gdb.Value pyobject pointers already visited
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whilst generating this value (to guard against infinite recursion when
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visiting object graphs with loops). Analogous to Py_ReprEnter and
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Py_ReprLeave
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'''
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class FakeRepr(object):
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@ -209,6 +215,8 @@ class PyObjectPtr(object):
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'instance': PyInstanceObjectPtr,
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'NoneType': PyNoneStructPtr,
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'frame': PyFrameObjectPtr,
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'set' : PySetObjectPtr,
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'frozenset' : PySetObjectPtr,
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}
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if tp_name in name_map:
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return name_map[tp_name]
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@ -230,8 +238,8 @@ class PyObjectPtr(object):
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return PyUnicodeObjectPtr
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if tp_flags & Py_TPFLAGS_DICT_SUBCLASS:
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return PyDictObjectPtr
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#if tp_flags & Py_TPFLAGS_BASE_EXC_SUBCLASS:
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# return something
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if tp_flags & Py_TPFLAGS_BASE_EXC_SUBCLASS:
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return PyBaseExceptionObjectPtr
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#if tp_flags & Py_TPFLAGS_TYPE_SUBCLASS:
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# return PyTypeObjectPtr
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@ -258,6 +266,22 @@ class PyObjectPtr(object):
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def get_gdb_type(cls):
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return gdb.lookup_type(cls._typename).pointer()
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def as_address(self):
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return long(self._gdbval)
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class ProxyAlreadyVisited(object):
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'''
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Placeholder proxy to use when protecting against infinite recursion due to
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loops in the object graph.
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Analogous to the values emitted by the users of Py_ReprEnter and Py_ReprLeave
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'''
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def __init__(self, rep):
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self._rep = rep
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def __repr__(self):
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return self._rep
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class InstanceProxy(object):
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@ -287,15 +311,19 @@ def _PyObject_VAR_SIZE(typeobj, nitems):
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class HeapTypeObjectPtr(PyObjectPtr):
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_typename = 'PyObject'
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def proxyval(self):
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def proxyval(self, visited):
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'''
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Support for new-style classes.
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Currently we just locate the dictionary using a transliteration to
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python of _PyObject_GetDictPtr, ignoring descriptors
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'''
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attr_dict = {}
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('<...>')
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visited.add(self.as_address())
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attr_dict = {}
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try:
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typeobj = self.type()
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dictoffset = int_from_int(typeobj.field('tp_dictoffset'))
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@ -313,16 +341,39 @@ class HeapTypeObjectPtr(PyObjectPtr):
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dictptr = self._gdbval.cast(_type_char_ptr) + dictoffset
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PyObjectPtrPtr = PyObjectPtr.get_gdb_type().pointer()
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dictptr = dictptr.cast(PyObjectPtrPtr)
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attr_dict = PyObjectPtr.from_pyobject_ptr(dictptr.dereference()).proxyval()
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attr_dict = PyObjectPtr.from_pyobject_ptr(dictptr.dereference()).proxyval(visited)
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except RuntimeError:
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# Corrupt data somewhere; fail safe
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pass
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pass
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tp_name = self.safe_tp_name()
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# New-style class:
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return InstanceProxy(tp_name, attr_dict, long(self._gdbval))
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class ProxyException(Exception):
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def __init__(self, tp_name, args):
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self.tp_name = tp_name
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self.args = args
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def __repr__(self):
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return '%s%r' % (self.tp_name, self.args)
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class PyBaseExceptionObjectPtr(PyObjectPtr):
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"""
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Class wrapping a gdb.Value that's a PyBaseExceptionObject* i.e. an exception
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within the process being debugged.
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"""
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_typename = 'PyBaseExceptionObject'
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def proxyval(self, visited):
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('(...)')
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visited.add(self.as_address())
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arg_proxy = PyObjectPtr.from_pyobject_ptr(self.field('args')).proxyval(visited)
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return ProxyException(self.safe_tp_name(),
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arg_proxy)
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class PyBoolObjectPtr(PyObjectPtr):
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"""
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@ -331,7 +382,7 @@ class PyBoolObjectPtr(PyObjectPtr):
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"""
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_typename = 'PyBoolObject'
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def proxyval(self):
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def proxyval(self, visited):
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if int_from_int(self.field('ob_ival')):
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return True
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else:
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@ -360,7 +411,7 @@ class PyCodeObjectPtr(PyObjectPtr):
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Analogous to PyCode_Addr2Line; translated from pseudocode in
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Objects/lnotab_notes.txt
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'''
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co_lnotab = PyObjectPtr.from_pyobject_ptr(self.field('co_lnotab')).proxyval()
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co_lnotab = PyObjectPtr.from_pyobject_ptr(self.field('co_lnotab')).proxyval(set())
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# Initialize lineno to co_firstlineno as per PyCode_Addr2Line
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# not 0, as lnotab_notes.txt has it:
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@ -381,27 +432,37 @@ class PyDictObjectPtr(PyObjectPtr):
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"""
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_typename = 'PyDictObject'
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def proxyval(self):
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def proxyval(self, visited):
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('{...}')
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visited.add(self.as_address())
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result = {}
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for i in safe_range(self.field('ma_mask') + 1):
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ep = self.field('ma_table') + i
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pvalue = PyObjectPtr.from_pyobject_ptr(ep['me_value'])
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if not pvalue.is_null():
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pkey = PyObjectPtr.from_pyobject_ptr(ep['me_key'])
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result[pkey.proxyval()] = pvalue.proxyval()
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result[pkey.proxyval(visited)] = pvalue.proxyval(visited)
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return result
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class PyInstanceObjectPtr(PyObjectPtr):
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_typename = 'PyInstanceObject'
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def proxyval(self):
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def proxyval(self, visited):
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('<...>')
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visited.add(self.as_address())
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# Get name of class:
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in_class = PyObjectPtr.from_pyobject_ptr(self.field('in_class'))
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cl_name = PyObjectPtr.from_pyobject_ptr(in_class.field('cl_name')).proxyval()
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cl_name = PyObjectPtr.from_pyobject_ptr(in_class.field('cl_name')).proxyval(visited)
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# Get dictionary of instance attributes:
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in_dict = PyObjectPtr.from_pyobject_ptr(self.field('in_dict')).proxyval()
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in_dict = PyObjectPtr.from_pyobject_ptr(self.field('in_dict')).proxyval(visited)
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# Old-style class:
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return InstanceProxy(cl_name, in_dict, long(self._gdbval))
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@ -410,11 +471,10 @@ class PyInstanceObjectPtr(PyObjectPtr):
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class PyIntObjectPtr(PyObjectPtr):
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_typename = 'PyIntObject'
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def proxyval(self):
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def proxyval(self, visited):
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result = int_from_int(self.field('ob_ival'))
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return result
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class PyListObjectPtr(PyObjectPtr):
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_typename = 'PyListObject'
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@ -423,8 +483,13 @@ class PyListObjectPtr(PyObjectPtr):
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field_ob_item = self.field('ob_item')
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return field_ob_item[i]
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def proxyval(self):
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result = [PyObjectPtr.from_pyobject_ptr(self[i]).proxyval()
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def proxyval(self, visited):
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('[...]')
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visited.add(self.as_address())
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result = [PyObjectPtr.from_pyobject_ptr(self[i]).proxyval(visited)
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for i in safe_range(int_from_int(self.field('ob_size')))]
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return result
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@ -432,7 +497,7 @@ class PyListObjectPtr(PyObjectPtr):
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class PyLongObjectPtr(PyObjectPtr):
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_typename = 'PyLongObject'
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def proxyval(self):
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def proxyval(self, visited):
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'''
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Python's Include/longobjrep.h has this declaration:
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struct _longobject {
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@ -477,7 +542,7 @@ class PyNoneStructPtr(PyObjectPtr):
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"""
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_typename = 'PyObject'
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def proxyval(self):
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def proxyval(self, visited):
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return None
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@ -489,16 +554,39 @@ class PyFrameObjectPtr(PyObjectPtr):
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return str(fi)
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class PySetObjectPtr(PyObjectPtr):
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_typename = 'PySetObject'
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def proxyval(self, visited):
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('%s(...)' % self.safe_tp_name())
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visited.add(self.as_address())
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members = []
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table = self.field('table')
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for i in safe_range(self.field('mask')+1):
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setentry = table[i]
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key = setentry['key']
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if key != 0:
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key_proxy = PyObjectPtr.from_pyobject_ptr(key).proxyval(visited)
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if key_proxy != '<dummy key>':
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members.append(key_proxy)
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if self.safe_tp_name() == 'frozenset':
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return frozenset(members)
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else:
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return set(members)
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class PyStringObjectPtr(PyObjectPtr):
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_typename = 'PyStringObject'
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def __str__(self):
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field_ob_size = self.field('ob_size')
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field_ob_sval = self.field('ob_sval')
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char_ptr = field_ob_sval.address.cast(_type_char_ptr)
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return ''.join([chr(field_ob_sval[i]) for i in safe_range(field_ob_size)])
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char_ptr = field_ob_sval.address.cast(_type_unsigned_char_ptr)
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return ''.join([chr(char_ptr[i]) for i in safe_range(field_ob_size)])
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def proxyval(self):
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def proxyval(self, visited):
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return str(self)
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@ -510,8 +598,13 @@ class PyTupleObjectPtr(PyObjectPtr):
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field_ob_item = self.field('ob_item')
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return field_ob_item[i]
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def proxyval(self):
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result = tuple([PyObjectPtr.from_pyobject_ptr(self[i]).proxyval()
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def proxyval(self, visited):
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# Guard against infinite loops:
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if self.as_address() in visited:
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return ProxyAlreadyVisited('(...)')
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visited.add(self.as_address())
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result = tuple([PyObjectPtr.from_pyobject_ptr(self[i]).proxyval(visited)
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for i in safe_range(int_from_int(self.field('ob_size')))])
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return result
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@ -523,7 +616,7 @@ class PyTypeObjectPtr(PyObjectPtr):
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class PyUnicodeObjectPtr(PyObjectPtr):
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_typename = 'PyUnicodeObject'
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def proxyval(self):
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def proxyval(self, visited):
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# From unicodeobject.h:
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# Py_ssize_t length; /* Length of raw Unicode data in buffer */
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# Py_UNICODE *str; /* Raw Unicode buffer */
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@ -576,13 +669,13 @@ class FrameInfo:
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if not value.is_null():
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name = PyObjectPtr.from_pyobject_ptr(self.co_varnames[i])
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#print 'name=%s' % name
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value = value.proxyval()
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value = value.proxyval(set())
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#print 'value=%s' % value
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self.locals.append((str(name), value))
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def filename(self):
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'''Get the path of the current Python source file, as a string'''
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return self.co_filename.proxyval()
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return self.co_filename.proxyval(set())
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def current_line_num(self):
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'''Get current line number as an integer (1-based)
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@ -626,7 +719,7 @@ class PyObjectPtrPrinter:
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self.gdbval = gdbval
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def to_string (self):
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proxyval = PyObjectPtr.from_pyobject_ptr(self.gdbval).proxyval()
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proxyval = PyObjectPtr.from_pyobject_ptr(self.gdbval).proxyval(set())
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return stringify(proxyval)
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@ -39,7 +39,7 @@
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Summary: Version 3 of the Python programming language aka Python 3000
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Name: python3
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Version: %{pybasever}.2
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Release: 2%{?dist}
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Release: 3%{?dist}
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License: Python
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Group: Development/Languages
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Source: http://python.org/ftp/python/%{version}/Python-%{version}.tar.bz2
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@ -74,7 +74,7 @@ Source3: macros.pybytecompile
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#
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# Downloaded from:
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# http://bugs.python.org/issue8032
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# This is Tools/gdb/libpython.py from v3 of the patch
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# This is Tools/gdb/libpython.py from v4 of the patch
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Source4: python-gdb.py
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# Systemtap tapset to make it easier to use the systemtap static probes
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@ -695,6 +695,11 @@ rm -fr %{buildroot}
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%changelog
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* Thu Mar 25 2010 David Malcolm <dmalcolm@redhat.com> - 3.1.2-3
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- update python-gdb.py from v3 to v4 (fixing infinite recursion on reference
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cycles and tracebacks on bytes 0x80-0xff in strings, adding handlers for sets
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and exceptions)
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* Wed Mar 24 2010 David Malcolm <dmalcolm@redhat.com> - 3.1.2-2
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- refresh gdb hooks to v3 (reworking how they are packaged)
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